* emit-rtl.c (gen_highpart): initialize `word' properly for pseudo.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@19271 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 9790268..23a0e8f 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+Fri Apr 17 16:35:35 1998  Greg McGary  <gkm@gnu.org>
+
+       * emit-rtl.c (gen_highpart): initialize `word' properly for pseudo.
+
 Fri Apr 17 14:30:37 1998  John Carr <jfc@mit.edu>
 
        * emit-rtl.c (operand_subword_force): If a register can not be

diff --git a/gcc/emit-rtl.c b/gcc/emit-rtl.c
index 40b0aa5..aafc41c 100644 (file)
--- a/gcc/emit-rtl.c
+++ b/gcc/emit-rtl.c
@@ -1011,18 +1011,24 @@ gen_highpart (mode, x)
     }
   else if (GET_CODE (x) == REG)
     {
-      int word = 0;
+      int word;
 
       /* Let the backend decide how many registers to skip.  This is needed
          in particular for sparc64 where fp regs are smaller than a word.  */
       /* ??? Note that subregs are now ambiguous, in that those against
-        pseudos are sized by the Word Size, while those against hard
+        pseudos are sized by the word size, while those against hard
         regs are sized by the underlying register size.  Better would be
         to always interpret the subreg offset parameter as bytes or bits.  */
 
-      if (! WORDS_BIG_ENDIAN && REGNO (x) < FIRST_PSEUDO_REGISTER)
+      if (WORDS_BIG_ENDIAN)
+       word = 0;
+      else if (REGNO (x) < FIRST_PSEUDO_REGISTER)
        word = (HARD_REGNO_NREGS (REGNO (x), GET_MODE (x))
                - HARD_REGNO_NREGS (REGNO (x), mode));
+      else
+       word = ((GET_MODE_SIZE (GET_MODE (x))
+                - MAX (GET_MODE_SIZE (mode), UNITS_PER_WORD))
+               / UNITS_PER_WORD);
 
       if (REGNO (x) < FIRST_PSEUDO_REGISTER
          /* integrate.c can't handle parts of a return value register.  */